Who is Dr. Guntram Shatterhand a.k.a. Ernst Stavro Blofeld from You Only Live Twice and what is their importance?

Dr. Shatterhand is Ernst Stavro Blofeld in disguise. He's a fugitive from justice who is responsible for the death of James Bond's wife Tracy nine months earlier. He and his wife, Irma Bunt, who changes her name to Frau Emmy Shatterhand, come to Japan under the guise of wanting to set up a research site in Japan.